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US-42 over I 71; I 75

Boone County, Kentucky · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

US-42 over I 71; I 75 in Boone County, Kentucky, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1960, making it 65 years old at the 2025 inventory.
It carries about 14,841 vehicles a day (traffic count year 2019).
Its listed owner is the state highway agency.
It is one of 74 of the 139 inventoried bridges in Boone County rated fair (53.2%); 8 (5.8%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous concrete tee beam
Length	about 327 ft
Location	1 Mi SW of Jct US 25
NBI structure number	008B00005R
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Kentucky department of transportation.

Bridge	Built	Vehicles/day	Condition
I-75 over Ky 18 Ramp	1990	140,378	Fair
I-75 Ramp over West Rmp KY18 to I75SB	1990	140,378	Fair
I-75 over Chambers Lane	1960	112,428	Fair
I-75 Nc over Turfway Road (ky 1017)	1960	90,720	Fair
I-75 over Turfway Road (ky 1017)	1960	90,720	Fair
I-75 Nc over Ky 536 (mt Zion Rd)	1992	70,784	Fair